Oil-water separation system for producing 2, 2, 4-trimethyl-1, 3-pentanediol monoisobutyrate and hexadecanol ester

Abstract

The utility model belongs to the technical field of oil-water separation equipment, and particularly relates to an oil-water separation system for producing dodecanol ester and cetyl alcohol ester. Comprising a reaction kettle, a condenser, a buffer tank, a mixed phase feeding pump, a separator feeding pipe, an oil-water separation tank, a water phase buffer tank, an alkali liquor tank, a neutralization buffer tank, a Venturi mixer, an MVR evaporator, a thickener, a centrifugal machine, a mother liquor buffer tank and an oil phase buffer tank. The condenser comprises a shell pass pipeline and a tube pass pipeline. The reaction kettle, the oil-water separation tank, the neutralization tank, the MVR evaporator, the thickener and the like are connected in series, an oil-water mixed phase after reaction is fed into the oil-water separation tank, efficient layering is realized in the oil-water separation tank depending on different oil-water densities, and then an oil phase and a water phase are respectively stored; the separated water phase is subjected to post-treatment, the acid content in the wastewater is reduced, and the oil phase is recycled, so that oil and water after oil-water separation can be reasonably treated, and pollution to natural water is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil-water separation equipment, and particularly relates to an oil-water separation system for producing dodecyl alcohol ester and hexadecyl alcohol ester. Background Art

[0002] Both dodecyl alcohol ester and hexadecyl alcohol ester are highly efficient and green water-based film-forming auxiliaries. They have good film-forming effects and can reduce the minimum film-forming temperature during emulsion polymerization. They are suitable for various water-based coatings such as emulsions, latex paints, and adhesives synthesized from (meth)acrylate, styrene, and vinyl acetate as raw materials, and are relatively commonly used film-forming auxiliaries in the current market.

[0003] In the process of producing dodecyl alcohol ester and hexadecyl alcohol ester, a large amount of mixed liquid of isobutyric acid and water will be generated. If isobutyric acid and water cannot be fully separated, it will not only cause great waste of resources, but also pose a great challenge to the sewage treatment station due to the large amount of acid-containing wastewater generated, and will also cause certain pollution to the environment.

[0004] Based on this, the utility model connects devices such as a reaction kettle, an oil-water separation tank, a neutralization tank, an MVR evaporator, and a thickener in series. The oil-water separation tank can effectively separate isobutyric acid from the acid-containing wastewater, store the water phase and the oil phase separately. The separated isobutyric acid (oil phase) can be recycled to reduce the consumption of isobutyric acid and save resources; through the oil-water separation tank, isobutyric acid and water can be completely separated, reducing the acid content in the wastewater and improving the treatment efficiency of subsequent treatment equipment; the separated oil and water can be reasonably treated to reduce the pollution of natural water bodies. Summary of the Utility Model

[0005] In order to solve the above technical problems, the present application proposes an oil-water separation system for producing dodecyl alcohol ester and hexadecyl alcohol ester, which is simple in structure and convenient to use. By connecting devices such as a reaction kettle, an oil-water separation tank, a neutralization tank, an MVR evaporator, and a thickener in series, and sending the oil-water mixed phase after the reaction into the oil-water separation tank, efficient stratification is achieved in the oil-water separation tank depending on the different densities of oil and water, and then the oil phase and the water phase are stored separately; the separated water phase is post-treated to reduce the acid content in the wastewater, and the oil phase is recycled, so that the separated oil and water can be reasonably treated to reduce the pollution of natural water bodies.

[0006] Based on the above purposes, the utility model adopts the following technical solutions:

[0007] An oil-water separation system for producing dodecyl alcohol ester and hexadecyl alcohol ester, comprising a reaction kettle, a condenser, a buffer tank, a mixed-phase feed pump, a separator feed pipe, an oil-water separation tank, an aqueous-phase buffer tank, an alkali solution tank, a neutralization buffer tank, a Venturi mixer, an MVR evaporator, a thickener, a centrifuge, a mother liquor buffer tank, and an oil-phase buffer tank;

[0008] The condenser includes a shell-side pipeline and a tube-side pipeline;

[0009] The outlet end at the top of the reaction kettle is connected to the inlet end of the shell-side pipeline of the condenser through a pipeline, and the outlet end of the shell-side pipeline of the condenser is connected to the inlet end of the buffer tank through a pipeline;

[0010] The outlet end of the buffer tank is connected to the inlet end of the mixed-phase feed pump through a pipeline, and the outlet end of the mixed-phase feed pump is connected to the inlet end of the separator feed pipe;

[0011] The oil-water separation tank is a horizontally arranged horizontal tank; the oil-water separation tank is composed of a tank body, a left head connected to the left end of the tank body, and a right head connected to the right end of the tank body;

[0012] A water-phase outlet is provided at the lower part of the left head of the oil-water separation tank, and an oil-phase outlet is provided at the upper part of the right head of the oil-water separation tank;

[0013] The water-phase outlet is connected with a Z-shaped pipe; the inlet at the lower end of the Z-shaped pipe is connected to the inside of the oil-water separation tank;

[0014] A mixed-phase feed structure is provided inside the oil-water separation tank;

[0015] The mixed-phase feed structure includes a flower pipe arranged inside the tank body. The right-end inlet of the flower pipe is connected to the outlet end of the separator feed pipe. The left end of the flower pipe is closed, and a row of small holes is provided on the side wall of the flower pipe;

[0016] The outlet end at the upper end of the Z-shaped pipe is connected to the inlet end of the aqueous-phase buffer tank through a pipeline;

[0017] The Venturi mixer is arranged at the top of the neutralization buffer tank. The Venturi mixer is provided with two inlet ends, namely a first inlet end and a second inlet end;

[0018] The outlet end of the aqueous-phase buffer tank is connected to the first inlet end of the Venturi mixer through a pipeline; the outlet end of the alkali solution tank is connected to the second inlet end of the Venturi mixer through a pipeline;

[0019] The outlet end at the bottom of the Venturi mixer is connected to the inlet end at the top of the neutralization buffer tank; the outlet end at the bottom of the neutralization buffer tank is connected to the inlet end of the MVR evaporator through a pipeline;

[0020] The outlet end of the MVR evaporator is connected to the inlet end of the thickener through a pipeline;

[0021] The outlet end of the thickener is connected to the inlet end of the centrifuge through a pipeline; the liquid outlet at the bottom of the centrifuge is connected to the mother liquor buffer tank through a pipeline;

[0022] The oil phase outlet is connected to the inlet end of the oil phase buffer tank through a pipeline.

[0023] Furthermore, the shell-side pipeline and tube-side pipeline structures of the condenser in the present utility model adopt the conventional settings in the prior art and are not the inventive points of the present utility model, so they will not be elaborated herein.

[0024] Furthermore, the inlet at the lower end of the Z-shaped tube is connected to the water phase outlet at the lower part of the left head, and the lower end of the Z-shaped tube can be fixedly connected to the left head by welding; the height of the outlet at the upper end of the Z-shaped tube in the vertical direction is lower than the height of the upper surface of the oil-water separation tank body; the oil phase outlet is located at a position on the right head close to the upper surface of the oil-water separation tank body.

[0025] Furthermore, a vent port is provided at the top of the oil-water separation tank, and the vent port can discharge gas when the pressure in the tank is too high; a sewage outlet is provided at the bottom of the oil-water separation tank, and the sewage outlet can discharge industrial salt.

[0026] Furthermore, a partition separation structure is also provided inside the oil-water separation tank.

[0027] Furthermore, the partition separation structure includes several partitions arranged inside the tank body.

[0028] Further preferably, four partitions are provided in the present utility model. The four partitions are all vertically arranged and are evenly arranged from left to right in sequence. Each partition is a large cut-circle structure, that is, each partition includes an arc-shaped edge at the bottom and a horizontal edge at the top; a square small hole is opened at the bottom of each partition, and the arc-shaped edge at the bottom of each partition is fixedly welded to the inner part of the tank body of the oil-water separation tank.

[0029] Furthermore, the perforated pipe is horizontally placed, and the perforated pipe passes through the four partitions from right to left in sequence.

[0030] Further preferably, manual valves are provided at the upper end outlet of the Z-shaped tube, the oil phase outlet, and the sewage outlet.

[0031] Furthermore, the height of the outlet at the upper end of the Z-shaped tube in the vertical direction is between the height of the oil phase outlet and the height of the top of the oil-water separation tank, ensuring that the oil phase located in the upper layer of the oil-water mixture phase can flow out from the top oil phase outlet, and the water phase located in the lower layer can flow out from the inlet end at the bottom of the Z-shaped tube;

[0032] In use, the oil-water mixed phase is pumped into the oil-water separation tank by the action of the mixed-phase feed pump. When the liquid level in the oil-water separation tank is higher than the lowest height of the oil-phase outlet, the valve at the oil-phase outlet is closed, and the mixed phase is continuously pumped. After being sprayed out through the small holes on the perforated pipe to achieve oil-water separation, the oil phase accumulates in the upper layer of the oil-water separation tank, and the water phase accumulates in the lower layer of the oil-water separation tank. The water phase is discharged from the Z-shaped pipe at the bottom of the tank by relying on the pressure of the mixed-phase feed pump and the gravity of the liquid in the tank. As the mixed phase in the oil-water separation tank is discharged, the liquid level in the oil-water separation tank gradually drops. When the oil-water stratification interface in the oil-water separation tank is just lower than the lowest height of the oil-phase outlet, the valve at the oil-phase outlet is opened to discharge the oil phase.

[0033] Furthermore, the four partition plates divide the entire oil-water separation tank into five relatively independent spaces that are interconnected. Compared with the entire tank body, the mixed phase can be separated more conveniently and efficiently in each independent space. At the same time, the height of the top of the partition plate is flush with the height of the oil-phase outlet in the vertical direction to ensure that the oil phase can flow out in time. A square small hole is opened at the bottom of each partition plate, which makes the independent spaces interconnected and the water phase can flow out smoothly.

[0034] Further preferably, the diameter of the separator feed pipe is larger than the diameter of the perforated pipe, which ensures that there is a certain pressure after the mixed phase enters the perforated pipe, so as to spray the mixed phase out of the small holes on the side wall of the perforated pipe.

[0035] In use, the mixed phase is sprayed upward from the small holes of the perforated pipe by relying on the pressure of the mixed-phase feed pump, and high-efficiency stratification is achieved by relying on the upward spraying force and the different densities of oil and water. The upper oil phase flows out from the top oil-phase outlet, and the lower water phase flows out from the inlet at the lower end of the Z-shaped pipe to achieve oil-water separation.

[0036] Furthermore, the first inlet end is located at the top of the Venturi mixer, and the second inlet end is located on one side of the Venturi mixer.

[0037] Furthermore, a water-phase feed pump is provided on the pipeline connecting the water-phase buffer tank and the first inlet end of the Venturi mixer; an alkali liquor feed pump is provided on the pipeline connecting the alkali liquor tank and the second inlet end of the Venturi mixer.

[0038] Furthermore, a neutralization tank feed pump is provided on the pipeline connecting the outlet end of the neutralization buffer tank and the inlet end of the MVR evaporator.

[0039] Furthermore, an evaporator feed pump is provided on the pipeline connecting the outlet end of the MVR evaporator and the inlet end of the thickener.

[0040] Furthermore, the bottom of the oil-phase buffer tank is provided with two outlet ends, namely the first outlet end and the second outlet end. The first outlet end is connected to the inlet end at the top of the reaction kettle through a pipeline, and the second outlet end is connected to an external acidification system through a pipeline.

[0041] Furthermore, a reflux pump is provided on the pipeline connecting the first outlet end to the inlet end at the top of the reactor.

[0042] The beneficial effects of the present utility model are as follows:

[0043] 1. By connecting devices such as a reactor, an oil-water separation tank, a neutralization tank, an MVR evaporator, and a thickener in series, and feeding the oil-water mixed phase after the reaction into the oil-water separation tank, efficient stratification is achieved in the oil-water separation tank depending on the different densities of oil and water, and then the oil phase and the water phase are stored separately; the separated water phase is post-treated to reduce the acid content in the wastewater, and the oil phase is recycled, so that the oil and water after oil-water separation can be reasonably treated, reducing the pollution to natural water bodies.

[0044] 2. By arranging four partition plates in the oil-water separation tank and evenly distributing them in the tank body, the entire oil-water separation tank is divided into five relatively independent and interconnected spaces; compared with the entire tank body, the mixed phase can be separated more conveniently and efficiently in each independent space. At the same time, the upper end of the partition plate is flush with the oil phase outlet to ensure that the oil phase can flow out in time; square small holes are opened at the bottom of the partition plate, which also makes each independent space interconnected, and the water phase can flow out smoothly; the partition plate reduces the flow rate of oil and water, increases the oil-water separation time, and makes the oil-water separation more thorough.

[0045] 3. In the present utility model, small holes are only provided on the side wall of the flower tube in the middle three sections of the space separated by the partition plates, that is, the small holes on the side wall of the flower tube are evenly distributed between the four partition plates, ensuring the relative constancy of the interface in the independent space and further improving the quality of oil-water separation.

[0046] 4. The structure of the present utility model is simple, easy to use, and can efficiently separate the oil-water mixed phase. Description of the Drawings

[0047] Figure 1 It is a schematic structural diagram of the oil-water separation system for producing dodecyl alcohol ester and hexadecyl alcohol ester described in Embodiment 1;

[0048] In the figure, 1. Reactor; 2. Buffer tank; 3. Oil-water separation tank; 4. Water phase buffer tank; 5. Alkali liquid tank; 6. Neutralization buffer tank; 7. MVR evaporator; 8. Thickener; 9. Oil phase buffer tank; 11. Condenser; 21. Mixed phase feed pump; 22. Separator feed pipe; 31. Z-shaped pipe; 32. Oil phase outlet; 33. Flower tube; 34. Drain port; 35. Drainage port; 36. Partition plate; 41. Water phase feed pump; 51. Alkali liquid feed pump; 61. Venturi mixer; 62. Neutralization tank feed pump; 71. Evaporator feed pump; 81. Centrifuge; 82. Mother liquid buffer tank; 91. Reflux pump. Detailed Embodiments

[0049] In order to make the technical means, technical features, achieved purposes and effects realized by the present utility model easy to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0050] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0051] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "provided with", "connection", etc. should be understood in a broad sense; for those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0052] In order to make the above objects, features and advantages of the present utility model more obvious and understandable, the specific embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present utility model. However, the present utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed below.

[0053] Embodiment 1

[0054] As Figure 1 shown, a system for producing dodecyl alcohol ester and hexadecyl alcohol ester includes a reaction kettle 1, a condenser 11, a buffer tank 2, a mixed-phase feed pump 21, a separator feed pipe 22, an oil-water separation tank 3, an aqueous-phase buffer tank 4, an alkali tank 5, a neutralization buffer tank 6, a Venturi mixer 61, an MVR evaporator 7, a thickener 8, a centrifuge 81, a mother liquor buffer tank 82, and an oil-phase buffer tank 9;

[0055] The condenser 11 includes a shell-side pipeline and a tube-side pipeline; in the present utility model, the structures of the shell-side pipeline and the tube-side pipeline of the condenser 11 adopt the conventional settings in the prior art and are not the inventive points of the present utility model, so they will not be elaborated here.

[0056] The outlet end at the top of the reactor 1 is connected to the inlet end of the shell-side pipeline of the condenser 11 through a pipeline, and the outlet end of the shell-side pipeline of the condenser 11 is connected to the inlet end at the top of the buffer tank 2 through a pipeline;

[0057] The outlet end at the left bottom of the buffer tank 2 is connected to the inlet end of the mixed-phase feed pump 21 through a pipeline, and the outlet end of the mixed-phase feed pump 21 is connected to the inlet end of the separator feed pipe 22.

[0058] The oil-water separation tank 3 is a horizontally arranged horizontal tank; the oil-water separation tank 3 is composed of a tank body, a left head connected to the left end of the tank body, and a right head connected to the right end of the tank body; in this application, both the left head and the right head can adopt the conventional structures in the prior art and are not the invention points of this application, so they will not be elaborated further; further, in this application, the left head, the tank body, and the right head are integrally formed.

[0059] A water phase outlet is provided at the lower part of the left head of the oil-water separation tank 3, and an oil phase outlet 32 is provided at the upper part of the right head of the oil-water separation tank 3;

[0060] The water phase outlet is connected to a Z-shaped pipe 31. Specifically, the inlet at the lower end of the Z-shaped pipe 31 is connected to the water phase outlet at the lower part of the left head, and the lower end of the Z-shaped pipe 31 can be fixedly connected to the left head by welding; the height of the outlet at the upper end of the Z-shaped pipe 31 in the vertical direction is lower than the height of the upper surface of the tank body of the oil-water separation tank 3; the oil phase outlet 32 is located at a position on the right head close to the upper surface of the tank body of the oil-water separation tank 3.

[0061] An air vent 34 is provided at the top of the oil-water separation tank 3, and the air vent 34 can discharge gas when the pressure in the tank is too high; a blowdown port 35 is provided at the bottom end of the oil-water separation tank 3, and the blowdown port 35 can discharge industrial salt.

[0062] A partition separation structure and a mixed-phase feed structure are provided inside the oil-water separation tank 3;

[0063] The partition separation structure includes four partitions 36 arranged in the tank body. The four partitions 36 are all vertically arranged and are evenly arranged from left to right in sequence. Each partition 36 is a large cut-circle structure, that is, each partition 36 includes an arc-shaped edge at the bottom and a horizontal edge at the top; a square small hole is opened at the bottom of each partition 36, and the arc-shaped edge at the bottom of each partition 36 is welded and fixed to the inside of the tank body of the oil-water separation tank 3;

[0064] The mixed-phase feed structure includes a flower tube 33 arranged in the tank body. The flower tube 33 is horizontally placed and passes through the four partitions 36 from right to left in sequence; the right inlet end of the flower tube 33 is connected to the outlet end of the separator feed pipe 22, the left end of the flower tube 33 is closed, and a row of small holes is opened on the side wall of the flower tube 33.

[0065] Further preferably, manual valves are provided at the upper end outlet of the Z-shaped pipe 31, the oil phase outlet 32, and the sewage outlet 35.

[0066] Furthermore, the height of the outlet at the upper end of the Z-shaped pipe 31 in the vertical direction is between the height of the oil phase outlet 32 and the height of the top of the oil-water separation tank 3, ensuring that the oil phase located in the upper layer of the oil-water mixed phase can flow out from the top oil phase outlet 32, and the water phase located in the lower layer can flow out from the inlet end of the Z-shaped pipe 31 at the bottom.

[0067] During use, under the action of the mixed phase feed pump 21, the oil-water mixed phase is pumped into the oil-water separation tank 3. When the liquid level in the oil-water separation tank 3 is higher than the lowest height of the oil phase outlet 32, the valve at the oil phase outlet 32 is closed, and the mixed phase is continuously pumped. After being sprayed out through the small holes on the flower pipe 33 to achieve oil-water separation, the oil phase is concentrated in the upper layer of the oil-water separation tank 3, and the water phase is concentrated in the lower layer of the oil-water separation tank 3. The water phase is discharged from the Z-shaped pipe 31 at the bottom of the tank by relying on the pressure of the mixed phase feed pump 21 and the gravity of the liquid in the tank. As the mixed phase in the oil-water separation tank 3 is discharged, the liquid level in the oil-water separation tank 3 gradually drops. When the oil-water stratification interface in the oil-water separation tank 3 is just lower than the lowest height of the oil phase outlet 32, the valve at the oil phase outlet 32 is opened to discharge the oil phase.

[0068] Four partitions 36 divide the entire oil-water separation tank 3 into five relatively independent spaces that are interconnected; compared with the entire tank body, the mixed phase can be separated more conveniently and efficiently in each independent space; at the same time, the height of the top of the partition 36 is flush with the height of the oil phase outlet 32 in the vertical direction, ensuring that the oil phase can flow out in time; a square small hole is opened at the bottom of each partition 36, which also makes each independent space interconnected, and the water phase can flow out smoothly.

[0069] Further preferably, in this embodiment, small holes are only provided on the side wall of the flower pipe 33 in the middle three spaces separated by the partition 36, that is, the small holes on the side wall of the flower pipe 33 are evenly distributed between the four partitions 36; no small holes are provided on the side wall of the flower pipe 33 at the left head close to the lower end of the Z-shaped pipe 31 or at the right head close to the oil phase outlet 32. The purpose of this setting is to ensure the relative constancy of the interface in the independent space.

[0070] The partition 36 used in the present utility model reduces the flow rate of the oil and water, increases the oil-water separation time, makes the oil-water separation more thorough, and further improves the quality of the oil-water separation.

[0071] The diameter of the separator feed pipe 22 is larger than the diameter of the flower pipe 33, ensuring that there is a certain pressure after the mixed phase enters the flower pipe 33, so as to spray the mixed phase out from the small holes on the side wall of the flower pipe 33.

[0072] In use, the mixed phase is ejected upward from the small holes of the flower tube 33 by the pressure of the mixed-phase feed pump 21. High-efficiency stratification is achieved by relying on the upward ejection force and the difference in the density of oil and water. The upper oil phase flows out from the top oil-phase outlet 32, and the lower water phase flows out from the inlet at the lower end of the Z-shaped tube 31, realizing the separation of oil and water.

[0073] The outlet end at the upper end of the Z-shaped tube 31 is connected and communicated with the inlet end of the water-phase buffer tank 4 through a pipeline.

[0074] The Venturi mixer 61 is arranged at the top of the neutralization buffer tank 6. The Venturi mixer 61 is provided with two inlet ends, namely a first inlet end and a second inlet end. Specifically, the first inlet end is located at the top of the Venturi mixer 61, and the second inlet end is located on one side of the Venturi mixer 61.

[0075] The outlet end of the water-phase buffer tank 4 is connected and communicated with the first inlet end of the Venturi mixer 61 through a pipeline; the outlet end of the lye tank 5 is connected and communicated with the second inlet end of the Venturi mixer 61 through a pipeline.

[0076] A water-phase feed pump 41 is provided on the pipeline connecting the water-phase buffer tank 4 and the first inlet end of the Venturi mixer 61; a lye feed pump 51 is provided on the pipeline connecting the lye tank 5 and the second inlet end of the Venturi mixer 61.

[0077] The outlet end at the bottom of the Venturi mixer 61 is connected and communicated with the inlet end at the top of the neutralization buffer tank 6; the outlet end at the bottom of the neutralization buffer tank 6 is connected and communicated with the inlet end of the MVR evaporator 7 through a pipeline; a neutralization tank feed pump 62 is provided on the pipeline connecting the outlet end of the neutralization buffer tank 6 and the inlet end of the MVR evaporator 7.

[0078] The outlet end of the MVR evaporator 7 is connected and communicated with the inlet end of the thickener 8 through a pipeline; an evaporator feed pump 71 is provided on the pipeline connecting the outlet end of the MVR evaporator 7 and the inlet end of the thickener 8.

[0079] The outlet end of the thickener 8 is connected and communicated with the inlet end of the centrifuge 81 through a pipeline; the liquid outlet end at the bottom of the centrifuge 81 is connected and communicated with the mother liquor buffer tank 82 through a pipeline.

[0080] The oil-phase outlet 32 is connected and communicated with the inlet end of the oil-phase buffer tank 9 through a pipeline. The bottom of the oil-phase buffer tank 9 is provided with two outlet ends, namely a first outlet end and a second outlet end. The first outlet end is connected and communicated with the inlet end at the top of the reaction kettle 1 through a pipeline, and the second outlet end is connected and communicated with an external acidification system through a pipeline.

[0081] A reflux pump 91 is provided on the pipeline connecting the first outlet end and the inlet end at the top of the reaction kettle 1.

[0082] The Venturi mixer 61 in this application is designed for the smooth transportation of two or more fluids before they enter the mixer. During the transportation process of the fluids, the mixing ratio is affected due to the unbalanced transportation pressure of individual fluids. In this case, the Venturi mixer 61 must be selected. The Venturi mixer 61 has the performance of a jet booster pump, and under the condition of ensuring the secondary flow rate, the outlet pressure of the material reaches the required pressure. The fluid mixing process is carried out by a series of mixing units of different specifications installed in a hollow pipeline. Due to the action of the mixing units, the fluid rotates left and right alternately, constantly changing the fluid direction. It not only pushes the central fluid to the periphery but also pushes the peripheral fluid to the center, thus creating a good radial mixing effect. At the same time, the rotation of the fluid itself also occurs at the interfaces of the adjacent component connections. This radial circulation mixing effect enables the material to achieve the purpose of uniform mixing.

[0083] The working principle of the Venturi mixer 61 is to let the fluid flow in the pipeline and impact various types of plate elements, increasing the velocity gradient of the fluid laminar flow or forming turbulence. In the case of laminar flow, it is "division - position movement - re - convergence". In the case of turbulence, in addition to the above three situations, the fluid will also generate intense vortices in the cross - section direction, and there is a strong shear force acting on the fluid, further dividing and mixing the fluid, and finally forming the required solution.

[0084] In this application, the main function of the MVR evaporator 7 is to evaporate the water in the sewage by mechanically compressing and recompressing the steam, concentrating the dissolved solids in the wastewater, thereby reducing the volume of the treated wastewater and improving the treatment efficiency.

[0085] In this application, the condenser 11, the mixed - phase feed pump 21, the Venturi mixer 61, the MVR evaporator 7, the thickener 8, and the centrifuge 81 can all adopt conventional equipment in the prior art, and their structures are not the invention points of this application, so they will not be elaborated further.

[0086] The operation process of this utility model is as follows:

[0087] First of all, dodecyl acetate and hexadecyl acetate react in the reaction kettle 1. During the process of synthesizing the reactants, a part of water is generated. The reactant (isobutyric acid) will form an oil - water mixed phase with water and be azeotroped out through the outlet end at the top of the reaction kettle 1;

[0088] Then the azeotrope enters the tube-side pipeline of the condenser 11, is condensed by the condenser 11 and then enters the mixed-phase buffer tank 2. Then, the oil-water mixed phase is pumped into the oil-water separation tank 3 through the separator feed pipe 22 by using the mixed-phase feed pump 21. In the oil-water separation tank 3, when the liquid level in the oil-water separation tank 3 is higher than the lowest height of the oil-phase outlet 32, the valve at the oil-phase outlet 32 is closed, and the mixed phase is continuously pumped. The mixed phase is sprayed upward from the small holes of the flower tube 33 by relying on the pressure of the mixed-phase feed pump 21, and efficient stratification is achieved by relying on the upward spraying force and the different densities of oil and water.

[0089] After the oil and water are separated by the flower tube 33, the oil phase is concentrated in the upper layer of the oil-water separation tank 3, and the water phase is concentrated in the lower layer of the oil-water separation tank 3. The water phase is discharged from the water-phase outlet at the bottom of the tank by relying on the pressure of the mixed-phase feed pump 21 and the gravity of the liquid in the tank.

[0090] As the mixed phase in the oil-water separation tank 3 is discharged, the liquid level in the oil-water separation tank 3 gradually drops. When the oil-water stratification interface in the oil-water separation tank 3 is just lower than the lowest height of the oil-phase outlet 32, the valve at the oil-phase outlet 32 is opened, and the oil phase is discharged into the oil-phase buffer tank 9; then the oil phase in the oil-phase buffer tank 9 can also be discharged to the external acidification system through the second outlet end of the oil-phase buffer tank 9, or the reflux pump 91 is turned on, and the oil phase (including isobutyric acid) in the oil-phase buffer tank 9 is refluxed to the reaction kettle 1 through the first outlet end of the oil-phase buffer tank 9 for re-reaction.

[0091] Then, the water phase separated in the oil-water separation tank 3 is discharged from the water-phase outlet through the Z-shaped pipe 31 to the water-phase buffer tank 4. At this time, the water-phase feed pump 41 and the lye feed pump 51 are turned on. The water phase and the lye undergo a neutralization reaction in the Venturi mixer 61 and then enter the neutralization buffer tank 6. After that, the neutralization tank feed pump 62 is turned on. The neutralized reaction liquid undergoes flash evaporation in the MVR evaporator 7 to obtain mother liquor. Then the evaporator feed pump 71 is turned on. The mother liquor is pre-dehydrated by the thickener 8 and then filtered by the centrifuge 81 connected below to separate out industrial salt. The separated mother liquor enters the mother liquor buffer tank 82 and then enters the subsequent de-acidification system for post-treatment.

[0092] By arranging the flower tube 33 and the partition plate 36 in the oil-water separation tank 3, the utility model improves the efficiency of oil-water separation and enhances the quality of oil-water separation.

[0093] The above embodiments only represent several implementation manners of the utility model. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the utility model, several deformations and improvements can still be made, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be subject to the appended claims.

Claims

1. An oil-water separation system for producing dodecyl alcohol ester and hexadecanol ester, characterized in that: Including reactor, condenser, buffer tank, mixed phase feed pump, separator feed pipe, oil-water separation tank, water phase buffer tank, alkali liquid tank, neutralization buffer tank, venturi mixer, MVR evaporator, thickener, centrifuge, mother liquor buffer tank, oil phase buffer tank; The condenser includes shell-side piping and tube-side piping; The outlet end of the top of the reactor is connected to the inlet end of the shell-side pipeline of the condenser through a pipeline, and the outlet end of the shell-side pipeline of the condenser is connected to the inlet end of the buffer tank through a pipeline; The outlet end of the buffer tank is connected to the inlet end of the mixed phase feed pump through a pipeline, and the outlet end of the mixed phase feed pump is connected to the inlet end of the separator feed pipe; The oil-water separation tank is a horizontal tank arranged horizontally; the oil-water separation tank is composed of a tank body, a left end cap connected to the left end of the tank body, and a right end cap connected to the right end of the tank body; The lower part of the left head of the oil-water separation tank is provided with a water phase outlet, and the upper part of the right head of the oil-water separation tank is provided with an oil phase outlet; The water phase outlet is connected with a Z-shaped tube; the inlet at the lower end of the Z-shaped tube is connected to the oil-water separation tank; The oil-water separation tank is provided with a mixed phase feeding structure; The mixed phase feeding structure comprises a flower tube arranged in the tank body, the right inlet end of the flower tube is connected to the outlet end of the separator feeding pipe, the left end of the flower tube is closed, and a row of small holes is provided on the side wall of the flower tube; The outlet end of the upper end of the Z-shaped tube is connected to the inlet end of the water phase buffer tank through a pipeline; The venturi mixer is arranged at the top of the neutralization buffer tank, and the venturi mixer is provided with two inlet ends, namely a first inlet end and a second inlet end; The outlet end of the water phase buffer tank is connected to the first inlet end of the venturi mixer through a pipeline; the outlet end of the alkali liquid tank is connected to the second inlet end of the venturi mixer through a pipeline; The outlet end at the bottom of the venturi mixer is connected to the inlet end at the top of the neutralization buffer tank; the outlet end at the bottom of the neutralization buffer tank is connected to the inlet end of the MVR evaporator through a pipeline; The outlet end of the MVR evaporator is connected to the inlet end of the thickener through a pipeline; The outlet end of the thickener is connected to the inlet end of the centrifuge through a pipeline; the liquid outlet end at the bottom of the centrifuge is connected to the mother liquid buffer tank through a pipeline; The oil phase outlet is connected to the inlet end of the oil phase buffer tank through a pipeline.

2. The oil-water separation system for producing dodecyl alcohol ester and hexadecanol ester according to claim 1, characterized in that: The inlet at the lower end of the Z-shaped tube is connected to the water phase outlet at the lower part of the left head.

3. The oil-water separation system for producing dodecyl alcohol ester and hexadecanol ester according to claim 1, characterized in that: The oil-water separation tank is also provided with a partition plate separation structure; the partition plate separation structure comprises a plurality of partition plates arranged in the tank body.

4. The oil-water separation system for producing dodecyl alcohol ester and hexadecanol ester according to claim 3, characterized in that: There are four partitions, all of which are vertically arranged and evenly arranged from left to right. Each partition is a large circular structure; a small square hole is provided at the bottom of each partition.

5. The oil-water separation system for producing dodecyl alcohol ester and hexadecanol ester according to claim 4, characterized in that: The flower tube is placed horizontally, and passes through four partitions from right to left in sequence.

6. The oil-water separation system for producing dodecyl alcohol ester and hexadecanol ester according to claim 1, characterized in that: Manual valves are provided at the upper outlet of the Z-shaped tube, the oil phase outlet and the sewage outlet.

7. The oil-water separation system for producing dodecyl alcohol ester and hexadecanol ester according to claim 1, characterized in that: A water phase feed pump is arranged on the pipeline connecting the water phase buffer tank and the first inlet end of the venturi mixer; and a alkali liquid feed pump is arranged on the pipeline connecting the alkali liquid tank and the second inlet end of the venturi mixer.

8. The oil-water separation system for producing dodecyl alcohol ester and hexadecanol ester according to claim 1, characterized in that: A neutralization tank feed pump is provided on a pipeline connecting the outlet of the neutralization buffer tank and the inlet of the MVR evaporator; an evaporator feed pump is provided on a pipeline connecting the outlet of the MVR evaporator and the inlet of the thickener.

9. The oil-water separation system for producing dodecyl alcohol ester and hexadecanol ester according to claim 1, characterized in that: The bottom of the oil phase buffer tank is provided with two outlet ends, namely a first outlet end and a second outlet end. The first outlet end is connected to the inlet end at the top of the reactor through a pipeline, and the second outlet end is connected to an external acidification system through a pipeline.

10. The oil-water separation system for producing dodecyl alcohol ester and hexadecanol ester according to claim 9, characterized in that: A reflux pump is arranged on the pipeline connecting the first outlet end and the inlet end at the top of the reactor.

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